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{"result": {"ics": [{"id": "ICSA-13-213-03", "type": "ics", "title": "IOServer Master Station Improper Input Validation", "description": "## OVERVIEW\n\nAdam Crain of Automatak and independent researcher Chris Sistrunk have identified an improper input validation vulnerability in the IOServer DNP3 Driver on the master station. IOServer has produced a new version that mitigates this vulnerability. The researchers have tested the new version to validate that it resolves the vulnerability.\n\nThis vulnerability could be exploited remotely.\n\n## AFFECTED PRODUCTS\n\nThe following IOServer product versions are affected:\n\n * IOServer\u2019s Beta2041.exe, and\n * IOServer\u2019s versions older than driver19.exe.\n\n## IMPACT\n\nThe master station device can be put into an infinite loop by sending a specially crafted TCP packet, known as \u201cTCP Connection Hijacking.\u201d The device must be manually restarted to recover from the loop condition.\n\nImpact to individual organizations depends on many factors that are unique to each organization. ICS\u2011CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.\n\n## BACKGROUND\n\nIOServer is a New Zealand-based company that maintains users in several countries around the world, including the UK, Canada, New Zealand, Australia, Austria, France, Germany, Netherlands, Italy, India, Czech Republic, China, Singapore, South Korea, South Africa, and Brazil.\n\nIOServer is a Windows-based (WindowsNT/95/98/ME/2000/2003/XP/2008/7) OPC Server that allows OPC clients such as human-machine interface and supervisory control and data acquisition systems to exchange plant floor data with programmable logic circuits. According to IOServer, the affected products are deployed across multiple sectors including manufacturing, building automation, oil and gas, water and wastewater, electric utilities, and others.\n\n## VULNERABILITY CHARACTERIZATION\n\n### VULNERABILITY OVERVIEW\n\n### IMPROPER INPUT VALIDATIONa\n\nThe IOServer driver does not validate or incorrectly validates input on the master server on Port 20000/TCP that can affect the control flow or data flow of a program. When this software does not validate input properly, an attacker is able to craft the input in a form that is not expected by the rest of the application. This will lead to parts of the system receiving unintended input, which may result in altered control flow or arbitrary control of a resource.\n\nAs a result, the IOServer enters an infinite loop condition without an exit. The system must then be restarted manually.\n\nCVE-2013-2790b has been assigned to this vulnerability. A CVSS v2 base score of 7.1 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:N/I:N/A:C).c\n\n### VULNERABILITY DETAILS\n\n#### EXPLOITABILITY\n\nThis vulnerability could be exploited remotely.\n\n#### EXISTENCE OF EXPLOIT\n\nNo known public exploits specifically target this vulnerability.\n\n#### DIFFICULTY\n\nAn attacker with a moderate skill would be able to exploit this vulnerability.\n\n## MITIGATION\n\nIOServer released Beta driver beta2042.exe resolves this vulnerability. This version has already been superseded by beta2043.exe. Information about this version of this product is available on the IOServer Web site:\n\n<http://www.ioserver.com/>\n\nThe researchers suggest the following mitigation:\n\n * Block DNP3 traffic from traversing onto business or corporate networks through the use of an IPS or firewall with DPN3-specific rule sets.\n\nICS\u2011CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.\n\n * Minimize network exposure for all control system devices. Critical devices should not directly face the Internet.\n * Locate control system networks and remote devices behind firewalls, and isolate them from the business network.\n * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPN is only as secure as the connected devices.\n\nICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT Web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.d ICS\u2011CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures.\n\nAdditional mitigation guidance and recommended practices are publicly available in the ICS\u2011CERT Technical Information Paper, ICS-TIP-12-146-01B\u2014Targeted Cyber Intrusion Detection and Mitigation Strategies,e that is available for download from the ICS-CERT Web page (<http://ics-cert.us-cert.gov/>).\n\nOrganizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS\u2011CERT for tracking and correlation against other incidents.\n\n * a. CWE-20: Improper Input Validation <http://cwe.mitre.org/data/definitions/20.html>, Web site last accessed August 01, 2013.\n * b. NVD, <http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-2790> , NIST uses this advisory to create the CVE Web site report. This Web site will be active sometime after publication of this advisory.\n * c. CVSS Calculator, [http://nvd.nist.gov/cvss.cfm?version=2&amp;vector=AV:N/AC:M/Au:N/C:N/I:N/A:C](<http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:N/A:C>), Web site last accessed August 01, 2013.\n * d. CSSP Recommended Practices, <http://ics-cert.us-cert.gov/content/recommended-practices>, Web site last accessed August 01, 2013.\n * e. Targeted Cyber Intrusion Detection and Mitigation Strategies, <http://ics-cert.us-cert.gov/tips/ICS-TIP-12-146-01B>, Web site last accessed August 01, 2013.\n", "published": "2013-08-01T00:00:00", "cvss": {"score": 7.8, "vector": "AV:NETWORK/AC:LOW/Au:NONE/C:NONE/I:NONE/A:COMPLETE/"}, "href": "https://ics-cert.us-cert.gov//advisories/ICSA-13-213-03", "cvelist": ["CVE-2013-2790"], "lastseen": "2017-12-04T19:02:14"}]}}